Some statements can be simplified for readability

We can replace lines like

```rust
assert!(engine.check_network_request(&request).matched == *expectation,
"Expected match = {} for {} from {} typed {} against {:?}", expectation, url, source_url, request_type, rules)
```

with

```rust
assert!(engine.check_network_request(&request).matched == *expectation,
"Expected match = {expectation} for {url} from {source_url} typed {request_type} against {rules:?}")
```

to improve code readability and developer productivity.

Search the repository for assertion messages that pass named values positionally, using the example in the issue as the pattern. Update applicable statements to the captured-format style, then run the existing Rust test suite and confirm the affected assertions still produce the intended messages.

Written by the indexing model from the issue text.